Rotary center arrangement for turning machines



Nov. 7, 1944. A.l GNESSIN 2,362,265

ROTARY CENTER ARRANGEM'ENT FOR TURNING MACHINES Filed oct. 7, 1943 'VE v 9 4V/513 14 Y 13 2* 13 HTToR/EY T97- BY mw Patented Nov. 7, 1944 UNITED/STATES PATENT orifice 'l ROTARY CENTER ARRANGEMENT FOR `TURNINGMACHINES.

braham Gncssin, Elizabeth, N. J.

' Application October-'7, 1943, ySerial N0. 505,272 i oclaims.

This invention relatesfto new `andusefuly improvements in a dead or stationary center holding means for lathes andother turning machines.

Heretofore, in the construction of lathes and other turning machines it has been common practice to equip the tail stock spindle of the machine with a device for` holding the center stationarily .in position in the tail stock spindle in a manner to engage the end of the work to be operated upon by the machine. work generally is turned by the machine, holding the center in position causes the work to "turn relative to the center, causing a certain amount of friction between these parts which is generally relieved by the application of a lubri cant at. the point where the center engages the centerv hole in the end of the' Work. However, the use of this lubricant in the prior art con- Since the `appended claims inA which Ythe various novel features of the invention `are-more set forth.

particularly In the accompanying drawing forming a ma- Y terial part of this disclosure:

:structions has not completely eliminated the..

:friction at this point, requiring that the center" '.-be periodically reground because of the wearing away of the center caused by the friction. It iis generally known that to useV a center construction of this type requires considerable skill in positioning the work in the machine to create :as little friction as possible vand at the ysame 'time hold the work in a steady position to be :accurately operated upon. l

It is the purpose of `this invention to provide a novel lmeans for rotatively supporting ,a center in the tail stock of a machine in a manner so that the center will turn with the work, eliminating all friction and the skill which is generally required in mounting the work in the machine to createas little friction as possible.

This arrangement, of inserting a fitted roller bearing between the center and the spindle, may be used in a variety of Ways, using `the present standard size `centers and spindles lor centers and spindles of varied shapes, the main feature of this invention being the idea of an arrangement whereby the center is free to turn while being held in pla-ce but separated from the spindle design. i

A further object of lthis invention proposes the by an anti friction bearing or bearings of any construction of a center supporting means whichmay be `used. in connection with center to center machines, lathes, chuck to center machines, external grinding machines, and all machines of a similar nature employing a turning point in a stationary position engaging a rotating object upon which work is to be done.

A` still further object of the invention proposes constructing the center holding means in shown in elevation.

lthe direction of the line 3-3 of Fig. 1.

Fig. 1 is a longitudinal sectional viewof a center and bearing constructed in accordance with this invention with a portion of this view being Fig. 2 is an end elevational viewlooking in' the direction of the line Z-Zjof Fig. 1.

Fig. 3 is amend-elevational view looking in Fig. 4 is a fragmentary enlarged sectional view taken on the line-4 4 of Fig. 1.v

Fig. 5 is an-end elevational view of a 'center holding means constructed in accordance with another form of the invention.

' Fig. 6 is a sectional view `taken cn the line 6--6 of Fig. 5 With a portion thereof being illustrated in elevation. l

Fig. 7 is a view similar to Fig. 1 but illustrating another form of theinvention. f

The dead or stationary center holding means for lathes `and otherturning machines, according to this invention, includes a cup-like frusto- 40` conical tubular housing I4 engaged into a frustoconical tapered opening I3 in the end of a spindle I2 of the tailstock of a lathe or other turning .machine tool.4 This vspindlevmay be an integral part of the tailstock or ibe attached thereto by the threaded socketl I or any other conventional manner. f y

A frusto-conical tubular center 4holding casing I5 is disposed within the tubular housing I4 and a cage and rollers I6.` are disposed between the adjacent facesof the housing I4 and the casing I 5. While oneparticular design of bearing is disclosed it should be borne in mind that other designs are equally applicable tothe construe'- tion. The particular bearingll illustrated on the drawing includes a cage I'I supporting a plu` rality of frusto-conical roller bearings I8. A flange I9 is disposed on the outer end of the housing I4 and is normally spaced slightly `from the end of the spindle Il] of the lathe or other turning machine. This flange I9has an inwardly directed section 20 spaced from and overlapping a ange 2| formed on the outer end of the casing I5. The inner end of the housing I4 is formed with aninwardly directed ilange 22.

The flange i9 -could `f-be used to pry out the center and/or the anti-friction bearing vfrom the spindle.

The inwardly directed section 20 of the flange I9 and the inwardly directedangeLZ 5to .retain the casing I in position Within the housing A14, preventing it from dropping out v`of ,the ends thereof.

A center 23 is shown mounted iin .position {within the casing I5 with its pointed end .projected beyond the ange I9 and the outer end of "the .An :important feature of the invention -resides .ein *..the f-.fagct that 'i the '..center 2.3 is :rotatively zsup :ported @with relationtto the 'spindle l0 so that iwhenitissengagedwvitn a .pieceaof .workit uwill lturn withzthe work, .reliminatinglfriction between the contacting surfaces cof .the :work and f center,

.causing the :work to be held steadily fin :position while at the same time permittingithessame free- ;dom- -of .rotation '1 asiis zgenerallymnownnin the.: art. .Sincethefc'enterZ is .not Aaan integral unitn/ith its ,bearing supporting 'members it .may be :removed and replaced inexpensivelyxsincethe bearings may .be used :fonsupporting a number .of centers vinvolvingmerely fthefexpense o'f replaclng the center.

Inflligs. 55 yan'dff fa :-modied fforn of the invention is illustrated iin 'fwhich :a `pair `.of spaced -ball .bearings I8a :and 8b l'are finter-posedbetween 'the' housing =I`4 and thefcas'ingf |f5. 'Th-ese ballfbear- `ings comprise concentric races havingspherical balls disposed therebetween lin fafrnanner to permit vthe :casing 115 to rotateffvreely relative tothe housing I4.

Thelhousing I4 lin= this f'formfof Fthefinvention is formed with ya flange 'I 9' which extends outwards relative to the center '3213. AIv'his"outwardly extending flange -I 9 lisprovided witn'an auxiliary n'ange 2ll'. 'The 'auxiliary'ange'llf-is fforme'cl lof a plu- Alrality :of yseparately A-arcuate'ly 'shaped members l*invention-is similar -to that previously shown ,and

like reference numerals identify like parts in each ofthe several Views.

'While I have 'illustrated' and described the Apreferred embodiments of -my invention, it is Ito be :understood 'that I donot limit myselflto the pre- 'ciseconstructions herein ldisclosed and Athe right is reserved to all changesfand modifications c om- 'ing within the fscope of the invention Aas dened 1in the appended claims.

Having thus described my invention, what I claim as new, and desire to secure by United States Letters Patent is:

1. In combination with a spindle of a lathe or other machine tool, a center-holding means, comprising a cup-like frusto-conical tubular housing engaging in a frusto-conical tapered opening in the end of said spindle, afrusto-conical tubular center holding casing disposed within said housing,;a;cage and rollers betweenxsaid housing and casing, and a center mounted in said casing and projecting from the end of said spindle.

- 2. In combination with a spindle of a lathe or ".oth'errmachine'tool, a center-holding means, comprising .a cup-like 'frusto-conical tubular housing engaging in a frusto conical tapered opening in the end of-said spindle, a frusto-conical tubular center iholding .casing disposed within said housing, a cage and rollers between said housing and Hcasing, and a center mounted in said casing and projecting .irom..the ,endyof said ispindle, vand a dangeonthe `outerend of .said housingslightly .spacedfromsaid-.body

' .3..Incombinaton withaspindleof alathe o1' other ,machine tool, a center-holding; means, comprising ,a rcup-like .frusto-conical ,tubular yhousing .engaging .in a `irustofconical .tapered Opening in lthe .end of .said spindle, ,a .truste-conical -tubular center.holdin g casing disposed within .said housing, acage and rollers :between .saidhousing and casing, .anda center .mounted in saidv casing `and projecting from the -.end .of said spindle, :anda llange on .the ,outer .endof said :housing .slightly .spaced from said `ibocly, esaid -ange having .an

outwardly .directed-section and an inwardly dirested .section vrelative to .-said housing.

fi. .In-.combination with-'a spindle of a lathe or other machine to.ol,.aicenter=holding means, comprising .a cup-like.frustoeconical tubular :housing engaging in .a frustoconical'taperedsopeningin the .end vof said spindle, `a .trusteconical `tubular center .holding .leasing vdisposed -vilithini said -housing, .acageland rollersbetweensaid housing and casing, and .a center mounted in said casing and vprojecting .from .thefend of fsaidfspindle, :and a `flange ,on .the outer .endiof .said ,housing slightly spaced .from said body, fsaid diange having :an outwardly directed section and an inwardly-'directed section relative :to :said housing, and an inwardly directed ange .formedon 7the zinner Yend roffsaid housing.

.5. vIn v.combination with .a 'spindle of a lathe or `othermachine tool,.a center-holding means,com prising `a vcup-like frusta-conical tubular hous- `in g .engaging ina frusto-conical tapered opening in `the end .of Asaid spindle, :a frusto-.conical tubular .center holding .casing :disposed Awithin .said housing, a cage yand lrollers between 'said housing and casing. and-a reentermounted in said casing and projecting from the'end .offsa'i'd spindle, said .bearings `comprising a roller :cage and .a plurality of. rollers.

6. .Incombination with a spindle of a .lathe or ,othelmachine tool, a. center-holding means, .comprising a cup-like frusto-conical tubular housing engaging in .a frusto--conical tapered nopening 'in the end of .said spindle, a truste-conical tubular center holding casing disposed within said housing, .a cage and `rollers Abetween said housingandcasing, anda center mounted in said casing and projecting from `the end of said vspindle, saidbearings comprising spaced-bearing sections consisting of .inner .and .outer races and balls in between.

'7. In combination with .afspindle .of -a lathe or other machine tool, a center-holding means, comprising a cup-like frusto-conical tubular housing engaging in a frusto-conical tapered opening in the end of said spindle, a frusto-conical tubular center holding casing disposed within said housing, a cage and rollers between said housing and casing, and a center mounted in said casing and projecting from the end of said spindle, said bearings comprising spaced bearing sections consisting of inner and outer races and roller bearings disposed between these races.

8. In combination with a spindle vof a lathe or other machine tool, a center-holding means, comprising a cup-like frusto-conical tubular housing engaging in a frusto-conical tapered opening in the end of said spindle, a frusto conical tubular center holding casing disposed` Within said housing, a cage and rollers between said housing and casing, and a center mounted in said casing and projecting from the end of said spindle, and a flange on the outer end of said housing slightly spaced from said body, anda plurality of arcuate ange sections vertically adjustably mounted on said flange.

9. In combination with a spindle of a lathe or other machine tool, a center-holding means,

comprising a cup-like frusto-conical tubular housing engaging in a frusto conical tapered opening in the end of said spindle, a frustoconical tubular center holding casing disposed within said housing, a cage and rollers between said housing and casing, and a center mounted in said casing and projecting from the end of said spindle, and a ange on the outer end of said housing slightly spaced from said body, and a plurality of arcuate ange sections vertically adjustably mounted on said ange, said arcuate flange sections being held in position by' means of screws passing through slots in said flange sections and threadedly engaging openings in said ange.

ABRAHAM GNESSIN. 

